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KO_(2) finds use in oxygen cylinders used for space and submarines. The fact(s) related to such use of KO_(2) is /are :

Consider a spherical gaseous cloud of mass density rho(r) in a free space where r is the radial distance from its centre. The gaseous cloud is made of particle of equal mass m moving in circular orbits about their common centre with the same kinetic energy K. The force acting on the particles is their mutual gravitational force. If rho(r) is constant with time. the particle number density n(r)= rho(r) /m is : (G=universal gravitational constant)